2010YOUY01 commented on PR #24353:
URL: https://github.com/apache/datafusion/pull/24353#issuecomment-5289265786

   > I found that `FilterExec` could buffer small filtered results indefinitely 
when its input was unbounded
   
   Was that only to buffer up to `batch_size` from the configuration? I think 
this is still intended for streaming input. It's a convention for each operator 
to produce reasonably large output batches, which helps downstream operators 
vectorize.


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